X+3x+x=81

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Solution for X+3x+x=81 equation: 



X+3X+X=81

We move all terms to the left:

X+3X+X-(81)=0

We add all the numbers together, and all the variables

5X-81=0

We move all terms containing X to the left, all other terms to the right

5X=81

X=81/5

X=16+1/5

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